Erratum: Our apologies but we gave the wrong reference to the Women's Health Initiative in the June notebook "Why fair tests are needed: a brief history". It should have been the combined hormone study rather than estrogen alone, that is, Rossouw JE, Anderson GL, Prentice RL,et al Writing Group for the Women's Health Initiative Investigators. Risks and benefits of estrogen plus progestin in healthy postmenopausal women: principal results From the Women's Health Initiative randomized controlled trial. JAMA 2002; 288:321-333. instead of Women’s Health Initiative Steering Committee. Effects of conjugated equine estrogen in postmenopausal women with hysterectomy: the Women’s Health Initiative randomized controlled trial. /JAMA/ 2004;*291*:1701–12.